These men held uncanonical claims to the papal office. Their names are listed below with the dates of their illegitimate reigns.[1]
St. Hippolytus, 217-235
Novatian, 251
Felix II, 355-22 Nov. 365
Ursinus, 366-367
Eulalius. 27 Dec. 418-419
Lawrence, 498; 501-505
Dioscorus 22 Sept. 530-13 Oct. 530
Theodore. 687
Paschal, 687
Constantine, 28 June 767-769
Philip, 31 July 768;
retired to his monastery on this day
John, 844
Anastasius, Aug. 855-Sept. 855
Christopher, July 903-Jan. 904
Boniface VII, June 974-July 974; Aug. 984-July 985
John XVI, Apr. 997-Feb. 998
Gregory. 1012
Benedict X, 5 April 1058-24 Jan. 1059
Honorius II, 28 Oct. 1061-1072
Clement III, 25 June 1080-8 Sept. 1100
Theodoric, 1100
Albert, 1102
Sylvester IV, 18 Nov. 1105-1111
Gregory VIII, 8 Mar. 1118-1121
Celestine II, Dec. 1124
Anacletus II, 14 Feb. 1130-25 Jan. 1138
Victor IV, Mar. 1138-29 May 1138
Submitted to Pope Innocent II
Victor IV, 7 Sept. 1159-20 Apr. 1164
Paschal III, 22 April. 1164-20 Sept. 1168
Callistus III, Sept. 1168-29 Aug. 1178
Submitted to Pope Alexander III
Innocent III, 29 Sept. 1179-1180
Nicholas V, 12 May 1328-25 Aug. 1330
Clement VII, 20 Sept (31 Oct.) 1378-25 ug. 1330
Benedict XIII, 28 Sept. 1394-23 May 1423
Alexander V, 26 June 1409-3 May 1410
John XXIII, 17 May 1410-29 May 1415
Deposition by Council of Constance ended the Western Schism, d. 22 Nov. 1419) Felix V, 5 Nov. 1439-7 April. 1449
[1] Noonon, James-Charles, Jr., The Church Visible: The Ceremonial life and Protocol of the Roman Catholic Church, (New York, NY: Viking Books, 1996), p. 389.